Hey.
Hope this is not a repost ( searched a little with keyword arena, queue etc... so sorry if it is ).
Posted last month an exploit about instant cast just after hearthstone ( http://www.mmowned.com/forums/wow-ex...tml#post765618 ), and this is almost the same, but a little bit more useful.
When you have the window of the queue displaying, you have 1 minute ( for arenas, 2 for bg ) to do this. Cast WHAT YOU WANT, instant or not, doesn't matter, and, just when the cast is over, spam "Enter" on the little window.
What'll happen ?
When you are in combat, you can't enter in bg, arena, or accept summoning. But, if you accept just after a cast, "combat" will "arrive" to late, and you'll be able to enter where you want. What is it useful for ? Go to tanaris, subscribe arenas there, and between each arena, one shot low lvl ( great for ambush, firebolt, what you want... )...
Sorry for my bad english, hope you'll understand.